Filter screen



1r. J. CLARK ,20S-758 FILTER SCREEN Filed July 20, 1957 2 Sheets-Sheet 1 ATTORNEY FILTER SCREEN Filed July 20, 1937 2 Sheets-Sheet 2 L/ BY INETW ATTORNEY `Patented .lune 25, 195i@ FILTER scREEN Thomas J. Clark, Carbondale, Pa., assignor` to Hendrick Manufacturing Company, a corporation of Pennsylvania l Application July 20, 1937, Serial No. 154,543 3 Claims. (Cl. 210-169) method and means for combining the supporting bars and their attached screening strips to form plained. The cross-bars 5 in any vparticular segments or units of various shapes. section are also arranged parallel to each other According to my plan of construction, the and are mounted, in some instances, with each screening strips may be rapidly and firmly end attached lto aside I of the screen, while in 1o mounted .on the supports without the necessity other cases only one end is attached to either 10 for expensive soldering, welding or braising of the side pieces and the other end is attached heretofore used, and I get as a result an efficient to either of the ends 2 or 3 of the screen, while screen with a minimum number of parts. instill other cases, one end is attached to one My construction is readily adaptable to the of the sides I of the screen and the other end 16 various requirements of screen construction and to -a diagonal bar 6 running diagonally with 15 application, such as providing the most advanrespect to the two sides of` the screen for a tageous direction of placement of the screening purpose hereinafter explained. strips and arranging said strips in such a man- While these strips 4 are attached to a number ner as to provide a wider opening on the egress of supporting bars 5 throughout their length, 2Q side of said screen as compared to that on the their ends lrest upon either the sides I of the 20 ingress side thereof; In addition, because of screen or the ends 2 or 3 or upon the diagonal my construction, the materials used may be cross-bar 6 in a manner hereinafter described. limited to those which are best suited to the While it is,\in general, desirable to have the' purpose from the standpoint of strength and screening strips lie parallel to each other in a freedom from attack or deterioration by the screen, itisoftendesirable, depending upon the 25 materials which it is desired to screen. manner `of mounting the screen and upon the 1- These and other advantages will be apparent particular function` that it is to perform with from the description and the drawings and will respect to other apparatus, such as a brush be elaborated upon in the claims. mounted to rotate in close proximity to the In the attached drawings, Fig. l is a plan View screen to brush away the solids and other mat- 30 of a screen constructed according to my inventer that will not pass through the screen, to tion in the form of a segment which may be arrange the strips of one group at an angle to used alone or as a part of a composite circular the strips of another group upon the screen. It screen for liquids or semi-liquids, such as sewage. is for the purpose of carrying out this variation 3g Fig. 2 iS a SeCtiOn 0f the Screen Shown in Fig. in direction of the strips that the diagonal bar 1. taken at the point A of said screen. E is placed upon and connected to the side bars Fig. 3 is a section of a supporting bar, taken I of the frame. f A along the line 3--3 of Fig. 2 and shows in detail It is to be understood that` this diagonal bar the method of mounting the Supplting bar and 6; may be placed at'various angles with respect also shows the method of fastening the screening to said frame or it may even be mounted to ex.- 40 strips. tend to the curved end-bars 2 and 3 of the Fig. 4 is a section on line 5 4 of Fig. 2 showing frame or to one of these end-bars and one of the means for supporting the ends of the screenthe sides of the screen or, indeed, a number of ing strips and their relative depth. such diagonal bars may be included within the Fig. 5 shows a modification of Fig. 4.. frame and running at various angles, depending 45 Fig. 6 shows a rectangular screen, being a upon the direction that it is desired to have the modication of Fig. 1. screening strips extend in any particular part of The screen of Fig. 1 is made up of side bars, the screen, depending upon the strengthenin I--I and curved end-pieces 2 and 3. The that is desired in any particular part. screening strips which are designated in general It is one of the advantages of my method of by 4 are securely mounted side by side upon the mounting and attaching the screening strips and cross-bars 5 with sufcient rmness to allow of their supporting bars that they may be readily their ends simply resting upon the ledges I2 of arranged in groups in various ways to take care the frame pieces I, 2 or 3 or diagonal bars 6 of the various requirements, arrangement, opwith sufficient spacing between them to allow erating and mounting of the screen. 55

My invention is applicable to screens for sewage and the like and relates particularly to the method and means for mounting and fastening screening strips to supporting bars and the the passage of liquid or semi-liquid substances Y mined size or bulk. These strips 4 are of diier ent depth, as will later be more particularly Vex- Fig. 2,A which shows a portion of Fig. 1, such as at A, illustrates my method of mounting the individual stripson a cross-bar 5, with one of their ends resting upon a portion of the diagonal bar 6. It will be seen that the cross-bar 5 is attached to the side I of the frame by extending through a iiange at the bottom thereof and having its end portion upset as at 1. This arrangement is shown more in detail in Fig.. 3 where the cross-bar 5 is shown in side view with its end at the left fastened to a downwardly extending flange on the side-piece I, as previously explained. This Fig. 3 shows a section of the screening strips as they are mounted in the cross-bar 5 and also shows at 8v three uniilled receptacles for the screening strips. While I have designated the screening strips generally as d' in Fig. l it will be seen from Fig. 3 that these strips are of diiierent depths and; I have designated the deeper ones as da and the ones of lesser. depth as ib` in. that gure. In this Figure 3 theseV screening strips 4a. and 4b are shown as contiguous to each other in groups of one l strip ia and two strips 4b, but these strips are in this contiguous arrangement only at the point of attachment to the cross-bar 5. Fig. 2 shows this contiguous arrangement at the point of fastening to the cross-bar 5, but also shows the arrangement of these strips in lengths between the cross-bar and their other supports, such as the diagonal bar 6. In addition to the spacing of these strips provided for by their configuration and their mounting in cross-bar 5, their ends are spaced apart by being bent back on themselves as. at 9. The supporting of the endsof vthese screening strips and their relative depths are shown in Fig. v4. While I have shown in Fig. 3 the crossbar 5 as attached to a depending iange of the side bar I of the frame,

this cross-bar 5 may be fastened more directly tothe bar I by meansv of a screw ID, as shown in Fig. 5. This means of attaching the cross-bars to the side bars is more applicable to cases where the cross-bar is to extend at other than a rightangle from the frame bar, but the mea-ns of fastening shown in Fig. 3` can be used also when the angle between `cross-bar and frame-bar is acute or obtuse.`

In Fig. 6 the 'screen l is of rectangular shape 501 which may also be used to form a large circular structure. The frame structure is designated as I., with the cross-bars 5 having their Iends mounted at. right-angles to the frame I, and my method of .mounting the screening-strips fl quite readily adapted to this form in a very simple manner.

The method and means of attaching the screening-strips da and ib to the cross-bar 5 is shown in Fig. 3. The bar 4a, having the greater depth, isrst inserted in the space or opening Band then a previously bent bar ib is placed on either side of it so as to completely fill the space 8. With these screening strips 4a and 4b in position in the receptacle 8, a chisel or similar tool is placed at the point II and struck with force, creating an indentation cross-wise on supporting bar and forcing the metal of the portion between the slots 8 laterally so as to pinch or crimp the strips da and lb in a firm and rigid position. It will thus be seen that every third strip is straight and of the greater depth and the others are denitely oiiset at their points of attachment to the cross-bars and are of lesser depths. This arrangement provides a deiinite spacing of the strips and, at the same time, ease of egress of the screened material from the underside oi the screen, due to the diierence in the depths of the strips.

The screening strips d or la and db and the cross and other bars may be made of manganese bronze which readily withstands the acids or other elements of sewage since these parts are fabricated by mechanical means rather than by graising, welding or soldering, my screen will be more durable and eflicient for a longer life.

By my invention a screen is produced in s. simple and cheap construction which may readily be assembled and taken and reconstructed to suit the conditions and requirements for the bearing bars may be readily detached from the frame bars and the number position oi the diagonal bars may be readily changed.

While I have shown and described two forms of screens, it will be understood that many other forms and conngurations may be constructed utilizing my method of arranging and supporting the screening strips cross-bars and it will also be understood that the direction of strips and cross-bars. their number and supports, be varied at will to suit the particular requirements of application.

I claim:

l. In a filtering screen, a support, slots in said support for the reception of screening strips, a series of straight strips located one in each slot, other screening strips located one on each side of and in contact with each of said straight strips in the slots and offset therefrom at each end of the slots an equal distance from and extending parallel thereto.

2. In a filtering screen, a screening strip support having slots therein for the reception of screening strips, a plurality of screening mounted and crimped in groups of three, side by side in the slots of said support, the center strip of each group extending normally from its slot and the strips on either side of said normally extending strip being offset laterally as they emerge from said slot to extend in spaced relation and parallel to said normally extending strip and to the strips extending from other slots.

3. In a iiltering screen, a frame consisting of a cross-bar provided .with a series of slots, a straight screening strip and two laterally offset screening strips located in each slot, and bearing bars for supporting the ends of said screening strips.

THOMAS J. CLARK.

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